Memory Management in Linux Kernel

What you’ll learn

Knowledge of Memory management in Linux Kernel

Requirements

Should be able to write/compile/load/unload Hello World Linux Kernel Modules

Description

Update: 16th Oct 2020: Added Notes/Examples used in the course

Physical Address space of processor and how to view it in Linux

Virtual Address space of processor

Kernel and User space virtual address space

Pages and Page Fault

How to convert virtual address into physical address and the format specifiers used to print

Low Memory and High Memory

Memory Allocation Mechanism – Buddy Allocator

Zones – /proc/buddyinfo

Dynamic Memory Allocation in Linux Kernel

Various flags used in kmalloc – GFP_KERNEL, GFP_ATOMIC, GFP_DMA

Differences between kmalloc and vmalloc

What happens when you pass 0 in kmalloc and vmalloc

Kernel Stack

API’s covered in this course:

virt_to_phys

phys_to_virt

kmalloc

kfree

krealloc

ksize

vmalloc

vfree

Commands used in this course:

qemu-system-x86

Who this course is for:

Developers curious about learning memory management in Linux Kernel